#define LED1 15
#define LED2 2
#define LED3 4               
#define LED4 17
#define LED11 23
#define LED22 22
#define LED33 21
#define LED44 19

void setup() 
{                         
pinMode(LED1,OUTPUT); 
pinMode(LED11,OUTPUT);  
pinMode(LED2,OUTPUT);  
pinMode(LED22,OUTPUT);
pinMode(LED3,OUTPUT);
pinMode(LED33,OUTPUT); 
pinMode(LED4,OUTPUT); 
pinMode(LED44,OUTPUT); 
}

void loop() 
{                           
  digitalWrite(LED1,HIGH);   
  delay(500);
  digitalWrite(LED1,LOW);   
  delay(500);
  digitalWrite(LED11,HIGH);   
  delay(500);
  digitalWrite(LED11,LOW);   
  delay(500); 
  digitalWrite(LED2,HIGH);   
  delay(500); 
  digitalWrite(LED2,LOW);   
  delay(500);  
  digitalWrite(LED22,HIGH);   
  delay(500);    
  digitalWrite(LED22,LOW);   
  delay(500);   
  digitalWrite(LED3,HIGH);   
  delay(500);   
  digitalWrite(LED3,LOW);   
  delay(500);        
  digitalWrite(LED33,HIGH);   
  delay(500);    
  digitalWrite(LED33,LOW);   
  delay(500);
  digitalWrite(LED4,HIGH);   
  delay(500); 
  digitalWrite(LED4,LOW);   
  delay(500);
  digitalWrite(LED44,HIGH);   
  delay(500);
  digitalWrite(LED44,LOW);   
  delay(500);     
}